diff options
| -rw-r--r-- | qtmips_machine/alu.cpp | 2 | ||||
| -rw-r--r-- | qtmips_machine/instruction.cpp | 73 | ||||
| -rw-r--r-- | qtmips_machine/machinedefs.h | 1 |
3 files changed, 74 insertions, 2 deletions
diff --git a/qtmips_machine/alu.cpp b/qtmips_machine/alu.cpp index ad0e3c9..f0e45a5 100644 --- a/qtmips_machine/alu.cpp +++ b/qtmips_machine/alu.cpp @@ -126,6 +126,8 @@ std::uint32_t machine::alu_operate(enum AluOp operation, std::uint32_t s, std::u return ((std::int32_t)s < (std::int32_t)t) ? 1 : 0; case ALU_OP_SLTU: return (s < t) ? 1 : 0; + case ALU_OP_MUL: + return (std::uint32_t)((std::int32_t)s * (std::int32_t)t); case ALU_OP_LUI: return t << 16; case ALU_OP_BSHFL: diff --git a/qtmips_machine/instruction.cpp b/qtmips_machine/instruction.cpp index 90a6ca1..21eaacb 100644 --- a/qtmips_machine/instruction.cpp +++ b/qtmips_machine/instruction.cpp @@ -163,6 +163,74 @@ static const struct InstructionMap alu_instruction_map[] = { .flags = FLAGS_ALU_T_R_STD}, }; +static const struct InstructionMap special2_instruction_map[] = { + IM_UNKNOWN, // 0 + IM_UNKNOWN, // 1 + {"MUL", IT_R, ALU_OP_MUL, NOMEM, nullptr, + .flags = FLAGS_ALU_T_R_STD}, // 32 + IM_UNKNOWN, // 3 + IM_UNKNOWN, // 4 + IM_UNKNOWN, // 5 + IM_UNKNOWN, // 6 + IM_UNKNOWN, // 7 + IM_UNKNOWN, // 8 + IM_UNKNOWN, // 9 + IM_UNKNOWN, // 10 + IM_UNKNOWN, // 11 + IM_UNKNOWN, // 12 + IM_UNKNOWN, // 13 + IM_UNKNOWN, // 14 + IM_UNKNOWN, // 15 + IM_UNKNOWN, // 16 + IM_UNKNOWN, // 17 + IM_UNKNOWN, // 18 + IM_UNKNOWN, // 19 + IM_UNKNOWN, // 20 + IM_UNKNOWN, // 21 + IM_UNKNOWN, // 22 + IM_UNKNOWN, // 23 + IM_UNKNOWN, // 24 + IM_UNKNOWN, // 25 + IM_UNKNOWN, // 26 + IM_UNKNOWN, // 27 + IM_UNKNOWN, // 28 + IM_UNKNOWN, // 29 + IM_UNKNOWN, // 30 + IM_UNKNOWN, // 31 + IM_UNKNOWN, // 32 + IM_UNKNOWN, // 33 + IM_UNKNOWN, // 34 + IM_UNKNOWN, // 35 + IM_UNKNOWN, // 36 + IM_UNKNOWN, // 37 + IM_UNKNOWN, // 38 + IM_UNKNOWN, // 39 + IM_UNKNOWN, // 40 + IM_UNKNOWN, // 41 + IM_UNKNOWN, // 42 + IM_UNKNOWN, // 43 + IM_UNKNOWN, // 44 + IM_UNKNOWN, // 45 + IM_UNKNOWN, // 46 + IM_UNKNOWN, // 47 + IM_UNKNOWN, // 48 + IM_UNKNOWN, // 49 + IM_UNKNOWN, // 50 + IM_UNKNOWN, // 51 + IM_UNKNOWN, // 52 + IM_UNKNOWN, // 53 + IM_UNKNOWN, // 54 + IM_UNKNOWN, // 55 + IM_UNKNOWN, // 56 + IM_UNKNOWN, // 57 + IM_UNKNOWN, // 58 + IM_UNKNOWN, // 59 + IM_UNKNOWN, // 60 + IM_UNKNOWN, // 61 + IM_UNKNOWN, // 62 + IM_UNKNOWN, // 63 +}; + static const struct InstructionMap special3_instruction_map[] = { IM_UNKNOWN, // 0 IM_UNKNOWN, // 1 @@ -224,7 +292,7 @@ static const struct InstructionMap special3_instruction_map[] = { IM_UNKNOWN, // 56 IM_UNKNOWN, // 57 IM_UNKNOWN, // 58 - {"RDHWR", IT_R, ALU_OP_NOP, NOMEM, nullptr, + {"RDHWR", IT_R, ALU_OP_RDHWR, NOMEM, nullptr, .flags = IMF_SUPPORTED | IMF_REGWRITE}, IM_UNKNOWN, // 60 IM_UNKNOWN, // 61 @@ -334,7 +402,8 @@ static const struct InstructionMap instruction_map[] = { IM_UNKNOWN, // 25 IM_UNKNOWN, // 26 IM_UNKNOWN, // 27 - IM_UNKNOWN, // 28 + {"REGIMM", IT_I, NOALU, NOMEM, special2_instruction_map, // SPECIAL2 + .flags = IMF_SUB_ENCODE(6, 0)}, IM_UNKNOWN, // 29 IM_UNKNOWN, // 30 {"SPECIAL3", IT_R, NOALU, NOMEM, special3_instruction_map, // diff --git a/qtmips_machine/machinedefs.h b/qtmips_machine/machinedefs.h index 258b76c..ef9ec0d 100644 --- a/qtmips_machine/machinedefs.h +++ b/qtmips_machine/machinedefs.h @@ -87,6 +87,7 @@ enum AluOp : std::uint8_t { ALU_OP_NOR, ALU_OP_SLT, ALU_OP_SLTU, + ALU_OP_MUL, ALU_OP_LUI, ALU_OP_BSHFL, ALU_OP_PASS_T, // Pass t argument without change for JAL |